
Allentown
- County:
- Lehigh County
- County Seat:
- Yes
- Area (mi²):
- 17.564
- State:
- Pennsylvania
Allentown is a city located in Lehigh County, Pennsylvania. Allentown has a 2025 population of 124,315. It is also the county seat of Lehigh County. Allentown is currently declining at a rate of -0.23% annually and its population has decreased by -1.12% since the most recent census, which recorded a population of 125,727 in 2020.
The average household income in Allentown is $68,251 with a poverty rate of 21.56%. The median age in Allentown is 32.4 years: 31.7 years for males, and 33.2 years for females.